Current Time in London, United Kingdom

London is the home of Greenwich Mean Time (GMT) — the baseline from which every UTC offset on Earth is measured. The city's Europe/London timezone switches between two states each year: GMT (UTC +0:00) during winter months and BST, British Summer Time (UTC +1:00) from late March to late October. This single-hour shift affects scheduling for millions of international businesses, traders, and remote teams every spring and autumn.

As one of the world's three major financial centres alongside New York and Tokyo, London's business hours carry outsized global weight. The London Stock Exchange (LSE) opens at 8:00 AM and closes at 4:30 PM GMT/BST. The "London-New York overlap window" — roughly 2:00 PM to 4:30 PM London time when both markets are simultaneously open — is the highest-liquidity period in global foreign exchange trading, accounting for over 30% of daily FX volume.

Scheduling calls across time zones requires knowing where London's business day falls relative to your city. London is 5 hours ahead of New York (EST), so a 9:00 AM meeting in London is 4:00 AM in New York — too early. The sweet spot for transatlantic calls is 2:00–5:00 PM London time (9:00 AM–12:00 PM ET). From Mumbai and Delhi (IST), London is 5 hours 30 minutes behind, making mid-afternoon India time (1:30–6:00 PM IST) the best window. From Singapore and Hong Kong (UTC +8:00), London is 7–8 hours behind, so Singapore mornings of 3:00–5:00 PM SGT correspond to 7:00–9:00 AM in London. Teams in Sydney face the greatest challenge — with a 10–11 hour gap, virtually no standard business hours overlap.

Daylight saving time in London follows the EU-origin rule: clocks advance one hour on the last Sunday in March at 1:00 AM GMT (becoming 2:00 AM BST) and fall back on the last Sunday in October at 2:00 AM BST (becoming 1:00 AM GMT). Importantly, this shift does not align with DST changes in the United States, which typically occur a few weeks earlier — creating brief periods where the usual US–UK time gap is one hour different from normal.